The hashCode(int[]) method of the java.util.Arrays class returns a hash code based on the contents of the specified array. For any two non-null int arrays a and b such that Arrays.equals(a, b), it is also the case that Arrays.hashCode(a) == Arrays.hashCode(b).Exampleimport java.util.Arrays; public class ArrayDemo {    public static void main(String[] args) {       int[] ival = new int[] { 3, 5 };       int retval = ival.hashCode();       System.out.println("The hash code of value1 is: " + retval);       ival = new int[] { 19, 75 };       retval = ival.hashCode(); ... Read More

The hashCode(Object[]) method of the java.util.Arrays class returns a hash code based on the contents of the specified array. If the array contains other arrays of elements, the hash code is based on their identities rather than their contents. For any two arrays a and b such that Arrays.equals(a, b), it is also the case that Arrays.hashCode(a) == Arrays.hashCode(b). Example import java.util.Arrays; public class ArrayDemo { public static void main(String[] args) { Object[] ob = new Object[] { 22, 7 }; ... Read More

The remove(Object) method of the class java.util.ArrayList removes the first occurrence of the specified element from this list, if it is present. If the list does not contain the element, it is unchanged.Exampleimport java.util.ArrayList; public class ArrayListDemo {    public static void main(String[] args) {       ArrayList arrlist = new ArrayList(5);       arrlist.add("G");       arrlist.add("E");       arrlist.add("F");       arrlist.add("M");       arrlist.add("E");       System.out.println("Size of list: " + arrlist.size());       for (String value : arrlist) {          System.out.println("Value = " + ... Read More

The addAll(int index, Collection

The addAll(Collection

The isAlive() method of the Thread class returns true if the thread is alive, which is anytime after the thread has been started but before it runs to completion.Exampleclass first implements Runnable {    public void run() {       try {          for(int i=0; i

We can use a private contractor in a Java while creating a singleton class. The Singleton's purpose is to control object creation, limiting the number of objects to only one. Since there is only one Singleton instance, any instance fields of a Singleton will occur only once per class, just like static fields. Singletons often control access to resources, such as database connections or sockets.ExampleThe easiest implementation consists of a private constructor and a field to hold its result, and a static accessor method with a name like getInstance().The private field can be assigned from within a static initializer block ... Read More

When a new thread begins its life cycle in the new state. It remains in this state until the program starts the thread. It is also referred to as a born thread.After this newly born thread is started, the thread becomes runnable. A thread in this state is considered to be executing its task.

While creating a thread class we must override the run() method of the Thread class. This method provides an entry point for the thread and you will put your complete business logic inside this method.Exampleclass ThreadDemo extends Thread {    private String threadName;    ThreadDemo( String name) {       threadName = name;       System.out.println("Creating " +        threadName );    }    public void run() {       System.out.println("Running " +          threadName );       try {          for(int i = 4; i ... Read More

The java.lang.Thread class is a thread of execution in a program. The Java Virtual Machine allows an application to have multiple threads of execution running concurrently. Following are the important points about Thread −Every thread has a priority. Threads with higher priority are executed in preference to threads with lower priority.Each thread may or may not also be marked as a daemon.There are two ways to create a new thread of execution.One is to declare a class to be a subclass of Thread.Another way to create a thread is to declare a class that implements the Runnable interface. Read More